I took the family with friends to Pumpkintown last night. Actually it was Oolonoy, SC to an old church building that had been gutted and set-up for Every Friday Night Bluegrass. If you have an instrument you just show up, get in the circle and pick with the boys.
You can find all the pics here: Oolenoy Friday Night
It begins when you get there. They have appropriate smoke breaks. And folks head out when they want to. They also take requests. Some of the boys picked in a circle in one room, while another group stood around and picked in another room and some young, around 10 year old or so boys and girls, were in another room.